GSW Hybrid Electric Heat Pump Installation guide

Brand: GSW

Model: Hybrid Electric Heat Pump

Type: Installation guide

November 2015

100269085

Hybrid Electric

Heat Pump Water Heater

Installa on Instruc ons and

Use & Care Guide

Keep this manual in the pocket on heater for future reference whenever maintenance, adjustment or service is required.

Retain your original receipt as proof of purchase.

LOW LEAD

NTENT

DO NOT RETURN THIS UNIT TO THE STORE

Read this manual and the labels on the water heater before you install,

operate, or service it. If you have diﬃ culty following the direc ons, or

aren’t sure you can safely and properly do any of this work yourself:

• Call our Technical Assistance Hotline at 1-888-479-8324 . We can help you with

installation, operations, troubleshooting, or maintenance. Before you call, write

down the model and serial number from the water heater’s data plate.

Incorrect installa on, opera on, or service can damage the water heater, your house

and other property, and present risks including ﬁ re, scalding, electric shock, and

explosion, causing serious injury or death.

Table of Contents Page

IMPORTANT SAFETY INFORMATION .................................3

GETTING STARTED ............................................................ 6

INSTALLATION ................................................................... 7

DIAGNOSTIC CODES ........................................................ 20

TROUBLESHOOTING CHART ...........................................22

MAINTENANCE ............................................................... 28

REPAIR PARTS ILLUSTRATION ..........................................33

COMPLETED INSTALLATION TYPICAL

xxxxx

Thermal Expansion Tank

Shut-off Valve

(Cold)

Primary Condensate

Drain (3/4” PVC)

Drain LineSuitable Drain Pan

Discharge Pipe

(Do Not Cap or Plug)

Temperature and

Pressure Relief Valve

Drain

Cold

(Inlet)

Hot

(Outlet)

Shut-off Valve

(Hot)

Air Filter

User Interface

Module (UIM)

Upper Element

and ECO

Condensate Drain

Access Cover

(See Figure 15, p.12)

Connectivity Port

Drain Valve

Lower Element

2 • Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide

SAFETY

Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide • 3

IMPORTANT SAFETY INFORMATION

Important informa on to keep

Fill out this sec on and keep this

manual in the pocket of the water

heater for reference.

Date Purchased:

Model number:

Serial number:

Maintenance performed:* Date:

This is the safety alert symbol. It is used to alert you to

poten al physical injury hazards. Obey all safety mes-

sages that follow this symbol to avoid possible property

damage, serious injury or death. Do not remove any

permanent instruc ons, labels, or the data plate from either the outside of

the water heater or on the inside of the access panels. Keep this manual

near the water heater.

DANGER

Read and follow all safety messages and instruc ons in

this manual.

DANGER indicates hazardous

situa on that, if not avoided, will

result in death or serious injury.

WARNING WARNING indicates a hazardous

situa on that, if not avoided, could

result in death or serious injury.

CAUTION CAUTION indicates a hazardous

situa on that, if not avoided, could

result in minor or moderate injury.

NOTICE NOTICE indicates prac ces not

related to physical injury.

*Drain and ﬂ ush tank, clean air ﬁ lter,

clean condensate pan, and remove and

inspect anode rod a er ﬁ rst six months

of opera on and at least annually

therea er. Operate the Temperature

and Pressure Relief Valve (T&P) annu-

ally and inspect T&P valve every 2-4

years (see the label on the T&P valve for

maintenance schedule). See the Main-

tenance sec on for more informa on

about maintaining this water heater.

4 • Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide

IMPORTANT SAFETY INFORMATION

To reduce the risk of property

damage, serious injury or death,

read and follow the precau ons below,

all labels on the water heater, and

the safety messages and instruc ons

throughout this manual.

RISKS DURING INSTALLATION

AND MAINTENANCE

Electric Shock Risk

Contact with the electrical

parts in the junction box,

behind the access doors

and inside the top shroud can result in

severe injury or death from electrical

shock:

• Disconnect power by opening the

circuit breaker or removing the

fuses before installing or servicing.

• Use a non-contact circuit tester to

confirm that power is off before

working on or near any electrical

parts.

• Replace the junction box cover and

access doors after servicing.

Lifting Risk

The water heater is

heavy. Follow these

precau ons to

reduce the risk of property damage,

injuries from li ing or impact injuries

from dropping the water heater.

• Use at least two people to lift the

water heater.

• Be sure you both have a good grip

before lifting.

• Unit is top heavy, u se an appli-

ance dolly (with strap) to move the

water heater.

RISKS DURING OPERATION

Scalding Risk

This water heater

can make water hot

enough to cause

severe burns instantly, resulting in

severe injury or death.

• Feel water before bathing or s how-

ering

• To reduce the risk of scalding,

install Thermostatic Mixing Valves

(temperature limiting valves) at

each point-of-use. These valves

automatically mix hot and cold

water to limit the temperature at

the tap. Mixing valves are available

from your local plumbing supplier .

Follow manufacturer’s instructions

for installation and adjustment of

the valves.

• The User Interface Module (UIM)

on this water heater have been

factory set to approximately

140°F/60°C. Higher temperatures

increase the risk of scalding. Refer

to the National Plumbing Code for

requirements limiting the allow-

able temperatures at fixtures in the

home. Thermostatic Mixing Valves

are particularly important to help

avoid scalding.

Temperature Time to Produce a

Serious Burn

120°F (49°C) More than 5 minutes

125°F (52°C) 1½ to 2 minutes

130°F (54°C) About 30 seconds

135°F (57°C) About 10 seconds

140°F (60°C) Less than 5 seconds

145°F (63°C) Less than 3 seconds

150°F (66°C) About 1½ seconds

155°F (68°C) About 1 second

For informa on about changing the

factory thermostat se ng(s), refer to

the “Adjusting the

Temperature” sec on in this manual

(“Step 12:”).

Regardless of the water heater

thermostat(s) se ng, higher tempera-

tures may occur in certain circum-

stances:

• In some cases, repeated small

draws of water can cause the

hot and cold water in the tank

to “stack” in layers. If this hap-

pens, the water can be as much

as 30F°/15C° hotter than the ther-

mostat setting. This temperature

variation is the result of your usage

pattern and is not a malfunction.

• Water temperature will be hot-

ter if someone adjusted the

thermostat(s) to a higher setting.

• Problems with the thermostat(s),

or other malfunctions may result in

higher than expected water tem-

peratures.

• If the water heater is in a hot envi-

ronment, the water in the tank can

become as hot as the surrounding

air, regardless of the thermostat

setting.

• If the water supplied to the water

heater is pre-heated (for example,

by a solar system) the temperature

in the tank may be higher than the

water heater’s thermostat setting.

To reduce the risk of unusually hot

water reaching the ﬁ xtures in the

house, install Thermosta c Mixing

Valves.

If anyone in your home is at par cular

risk of scalding (for example, the el-

derly, children, or people with disabili-

 es) or if there is a local code or state

law requiring a certain water tempera-

ture at the hot water tap, then these

precau ons are par cularly important.

SAFETY

Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide • 5

According to a na onal standard

American Society of Sanitary Engineer-

ing (ASSE 1070) and most local plumbing

codes, the water heater’s thermostat

should not be used as the sole means to

regulate water temperature and avoid

scalds.

Properly adjusted Thermosta c Mix-

ing Valves allow you to set the tank

temperature to a higher se ng without

increasing risk of scalds. A higher

temperature se ng allows the tank to

provide much more hot water and can

help provide proper water tempera-

tures for appliances such as dishwash-

ers and washing machines. Higher tank

temperatures (140°F/60°C) also kill

bacteria that cause a condi on known

as “smelly water” and can reduce the

levels of bacteria that cause water-

borne diseases.

Water Contamination Risk

Do not use chemicals that could con-

taminate the potable water supply. Do

not use piping that has been treated

with chromates, boiler seal, or other

chemicals.

Fire Risk

To reduce the risk of a

fire that could destroy

your home and serious-

ly injure or kill people:

• D o not store things that can burn

easily such as paper or clothes next

to the water heater.

• Be sure the junction box cover and

the access door covers are in place.

These covers keep debris from

entering and potentially being ignit-

ed, and help keep any internal fires

from spreading.

• Keep the water heater from becom-

ing wet. Immediately shut the water

heater off and have it inspected by a

qualified person if you find that the

wiring, thermostat(s) or surround-

ing insulation have been exposed to

water in any way (e.g., leaks from

plumbing, leaks from the water

heater itself can damage property

and could cause a fire risk). If the

water heater is subjected to flood

conditions or the thermostat(s) have

been submerged in water, the entire

water heater must be replaced.

• Make electrical connections prop-

erly, according to the instructions

on page 15. Use 10 gauge solid

copper wire. Use a UL listed or CSA

approved strain relief. Connect

ground wire to green ground screw.

Explosion Risk

High temperatures and

pressures in the water

heater tank can cause an

explosion resulting in property

damage, serious injury or death. A

new Temperature and Pressure (T&P)

Relief Valve is included with your water

heater to reduce risk of explosion by

discharging hot water. Additional

temperature and pressure protective

equipment may be required by local

codes.

A nationally recognized testing labora-

tory maintains periodic inspection of

the valve production process and certi-

fies that it meets the requirements

for Relief Valves for Hot Water Supply

Systems, ANSI Z21.22. The T&P Relief

Valve’s relief pressure must not exceed

the working pressure rating of the wa-

ter heater as stated on the rating plate.

Maintain the T&P Relief Valve properly.

Follow the maintenance instructions

provided by the manufacturer of the

T&P Relief Valve (label attached to T&P

Relief Valve) and the procedure on

page 31.

An explosion could occur if the T&P

Relief Valve or discharge pipe is

blocked. Do not cap or plug the T&P

Relief Valve or discharge pipe.

Fire and Explosion Risk if Hot Water is

Not Used for Two Weeks or More

CAUTION! Hydrogen gas builds up in

a hot water system when it is not used

for a long period (two weeks or more).

Hydrogen gas is extremely ﬂ ammable.

If the hot water system has not been

used for two weeks or more, open a

hot water faucet for several minutes at

the kitchen sink before using any elec-

trical appliances connected to the hot

water system. Do not smoke or have

an open ﬂ ame or other igni on source

near the faucet while it is open.

SAFETY

IMPORTANT SAFETY INFORMATION

6 • Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide

GETTING STARTED

Figure 1 - Flexible connectors use compres-

sion fittings and do not require soldering.

Figure 2 - Use a non-contact circuit tester

to insure that the power is off before you

work on a circuit.

Figure 3 - Install a Pressure Reducing Valve

if required.

Figure 4 - Condensate overflow flexible

tubing.

3/4” OD

3/4” ID

3/4” NPT

Elbow

Pipe

To Main

Drain Connection

Figure 5 - Main Drain Connection piping.

1Review all of the instruc ons

before you begin work.

Improper installa on can

damage the water heater, your home

and other property, and can present

risks of serious injury or death.

2Check with your local and

provincial authori es for any

local or provincial codes that

apply to your area. In the absence of

local and provincial codes, follow the

current edi ons of the Canadian

Electric Code ( CEC) and the Na onal

Plumbing Code ( NPC). The instruc ons

in this manual comply with na onal

codes, but the installer is responsible

for complying with local codes.

3Before you start, be sure you

have, and know how to use, the

following tools and supplies:

• Plumbing tools and supplies appro-

priate for the type of water pipes in

your home

• Threaded connectors (Figure 1) for

the cold and hot water pipes

• For homes plumbed with plastic

pipe, use threaded connectors suit-

able for the specific type of plastic

pipe used: CPVC and PEX (cross-

linked polyethylene). Do not use

PVC pipe.

• For homes with copper pipes, you

may purchase connector kits with

compression fittings that don’t

require soldering (Figure 1). Com-

pression fittings are easier to install

than soldering copper pipes.

• Teflon® tape or pipe joint com-

pound approved for potable water

• Tools to make the electrical connec-

tions (for example, screwdrivers,

wire strippers)

• Non-Contact circuit tester to check

for power (Figure 2)

• Water Pressure Gauge (Figure 6)

Recommended Accessories:

• Suitable drain pan (Figure 8)

• Automatic leak detection and shut-

off device

• Pressure Reducing Valve (Figure 3)

• Thermal Expansion Tank (Figure 7)

• Thermostatic Mixing Valves (Figure

• 1/2” Flexible tubing for Condensate

Overflow (Figure 4)

• 90° Elbow with 3/4” Female

Unthreaded Socket End X 3/4” Male

NPT Threaded End (Figure 5)

• 3/4” OD Plastic Pipe for Condensate

Drain (Figure 5)

GETTING STARTED

INSTALLATION

Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide • 7

Follow these steps for proper

installa on:

Step 1:

✓Verify that your

home is equipped

and up-to-date for

proper opera on

Installing a new water heater is the

perfect  me to examine your home’s

plumbing system and make sure the

system is up to current code standards.

There have likely been plumbing code

changes since the old water heater

was installed. We suggest installing the

following accessories and any other

needed changes to bring your home up

to the latest code requirements.

Use this checklist and inspect your

home. Install any devices you need to

comply with codes and assure that your

new water heater performs at its best.

Check with your local plumbing oﬃ cial

for more informa on.

✓Water pressure

We recommend checking your

home’s water pressure with a pressure

gauge (Figure 6). Most codes allow a

maximum incoming water pressure of

80 psi/550kPa.

HOW: Purchase an inexpensive water

pressure gauge available at your local

plumbing supplier . Connect the Water

Pressure Gauge to an outside faucet

and measure the maximum water

pressure experienced throughout the

day (highest water pressures o en oc-

cur at night).

Figure 6 - Use a Water Pressure Gauge to

make sure your home’s water pressure is

not too high.

Pressure Reducing Valves are available

at your local plumbing supplier .

✓Water pressure

increase caused by

thermal expansion

Verify that you have a properly sized

Thermal Expansion Tank (Figure 7). We

recommend installing an expansion

tank if your home does not have one.

Codes require a properly pressurized,

properly sized Thermal Expansion Tank

in homes that have backﬂ ow, check, or

pressure-reducing valves. (See illustra-

 on on inside front cover.)

Figure 7 - A Thermal Expansion Tank helps

protect the home’s plumbing system from

pressure spikes.

HOW: Connect the Thermal Expansion

Tank (available at your local plumbing

supplier ) to the cold water supply line

near the water heater. The expansion

tank contains a bladder and an air

charge. To work properly, the Thermal

Expansion Tank must be sized accord-

ing to the water heater’s tank capacity

and pressurized to match the home’s

incoming water pressure. Refer to the

installa on instruc ons provided with

the Thermal Expansion Tank for instal-

la on details.

INSTALLATION

8 • Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide

BACKGROUND: Water expands when

heated, and the increased volume

of water must have a place to go, or

thermal expansion will cause large

increases in water pressure (despite

the use of a Pressure Reducing Valve

on the home’s main water supply

line). Backﬂ ow preventers are o en

installed in water meters and may not

be readily visible. As a result, most

all plumbing systems today are now

“closed,” and many homes now need

a Thermal Expansion Tank.

A Thermal Expansion Tank is a prac -

cal and inexpensive way to help avoid

damage to the water heater, washing

machine, dishwasher, ice maker and

even toilet valves. If your toilet oc-

casionally runs for no apparent reason

(usually brieﬂ y at night), that may be

due to thermal expansion increasing

the water pressure temporarily.

✓Water pipe and

tank leaks

Leaks from plumbing pipes or from

the water heater itself can damage

property and could cause a ﬁ re risk.

• Install an automatic leak detec-

tion and shutoff device (available

at your local plumbing supplier).

These devices can detect water

leaks and can shut off the water

heater’s water supply if a leak

occurs.

Figure 8 - A suitable drain pan piped to an

adequate drain can help protect flooring

from leaks and drips.

• If damage could occur as a result

of a leak from the water heater or

plumbing, install the water heater

in a drain pan (available at your

local plumbing supplier) (Figure 8)

that is piped to an adequate drain.

The drain pan must be at least

2”/50mm wider than the diameter

of the water heater. Install the

drain pan so the water level would

be limited to a maximum depth of

1-3/4” ( 45mm).

✓Water tempera-

ture regula on

Figure 9 - Thermostatic Mixing Valves can

help prevent scalds.

Install Thermosta c Mixing Valves if it

is necessary (Figure 9) to regulate the

temperature of the water . Consult the

valve manufacturer’s instruc ons or a

qualiﬁ ed person.

. WARNING! Even if the water

heater thermostat is set to a rela vely

low temperature, hot water can scald.

Install Thermosta c Mixing Valves

to reduce the risk of scalding (page

4).

BACKGROUND: A Thermosta c Mix-

ing Valve mixes hot water from the

water heater with cold water to more

precisely regulate the temperature of

hot water supplied to ﬁ xtures. If you

aren’t sure if your plumbing system is

equipped with properly installed and

adjusted Thermosta c Mixing Valves ,

contact a qualiﬁ ed person for more

informa on.

Step 2:

Verify that the loca on

is appropriate

Before installing your water heater,

ensure that:

1The water heater will be:

• Installed indoors close to

the center of the plumbing

system.

• In a suitable drain pan (if required)

piped to an adequate drain (Figure

8).

• In an area that will not freeze

• In an area that is suitable for install-

ing the water heater vertically and

on a level surface.

• Installed where a typical home

appliance sound would not cause a

disturbance

• Not used for space heating.

NOTICE: Water heater must be level!

INSTALLATION

Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide • 9

INSTALLATION

2The loca on has adequate

space (clearances) for period-

ic servicing. For op mal water

heater eﬃ ciency, the unit must have

unrestricted airﬂ ow and requires a

minimum installa on space of 700 ³

(19.8m³). As an example, a room that

has an 8 foot tall ceiling and is 10

(3m) long by 8.75 (2.6m) wide would

contain 700 ³ (19.8m³).

NOTICE: This Heat Pump Water Heater

may be located within a required mini-

mum of 6in. (150mm) clearance from

a wall on the outlet side, however for

future service considera ons, a mini-

mum of 3 (900mm) from any

obstruc on on the back, le and right

side is recommended.

3The ﬂ oor can support the

weight of a full water heater.

Table 1

Capacity Filled Weight

50 Gal./189L 573lb (260kg)

66 Gal./250L 796lb (361kg)

80 Gal./303L 921lb (418kg)

4Your area is not prone to

earthquakes. If it is, use

special straps as required by

local building codes.

5The loca on is not prone to

physical damage by vehicles,

ﬂ ooding, or other risks.

6Avoid loca ons such as upper

ﬂ oors, or where a leak might

damage the structure or

furnishings. Due to the normal

corrosive ac on of water, the tank will

eventually leak. To minimize property

damage from leaks, inspect and

maintain your water heater in accor-

dance with this manual’s instruc ons.

Inspect the drain pan, pipes, and

surrounding area regularly and ﬁ x any

leaks found. Drain pans are available at

your local plumbing supplier. Leaks are

frequently in the plumbing system

itself and not the water heater.

7The unit cannot be placed into

any type of closet or small

enclosure, unless adequate

provisions are made for air exchange

(vented or louvered doors, etc.).

8To ensure op mal perfor-

mance and serviceability, a

minimum clearance of 6

inches must be maintained from all

sides and 6in (150mm) from the top

for access to the air ﬁ lter.

9The air ﬁ lter, condensa on

drain and controls must be

easily accessible for opera on

and service.

10 The site loca on must be

free from any corrosive

elements in the atmosphere

such as sulphur, ﬂ uorine, sodium and

chlorine. These elements are found in

aerosol sprays, detergents, bleaches,

air fresheners, paint and varnish

removers, refrigerants and many other

household products. In addi on,

excessive dust and lint may eﬀ ect the

opera on of the unit, see the Air Filter

Maintenance sec on in this manual.

11 The ambient air temperature

must also be considered when

installing this unit. In Eﬃ ciency

Mode the air temperature needs to be

above 45°F/7 °C and below 120°F/ 49°C

for heat pump opera on. If the air

temperature falls outside these upper

and lower limits, the electrical elements

will ac vate to meet the hot water

demand and the heat pump does not

operate in either Eﬃ ciency or Hybrid

Mode.

INSTALLATION

10 • Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide

Step 3:

Removing the old water

heater

1Read each installa on step

and decide if you have the

necessary skills to install the

water heater. Only proceed if you can

safely perform the work. If you are

not comfortable, have a qualiﬁ ed

person perform the installa on.

2Locate the water heater’s

circuit breaker and turn it

OFF (or remove the circuit’s

fuses).

3On the old water heater,

remove the electrical

junction box access panel.

Using a non-contact circuit tester,

check the wiring to make certain the

power is OFF.

WARNING! Working on an ener-

gized circuit can result in severe injury

or death from electrical shock.

4Disconnect the electrical

wires.

5Open a hot water faucet and

let the hot water run un l it

is cool (This may take 10

minutes or longer).

Figure 10 - Let the hot water run until it is

cool.

WARNING! Be sure the water runs

cool before draining the tank to re-

duce the risk of scalding.

6Connect a garden hose to

the drain valve and place the

other end of the hose in a

drain, outside, or a bucket. (Note

that sediment in the bo om of the

tank may clog the valve and prevent

it from draining. If you can’t get the

tank to drain, contact a qualiﬁ ed

person.)

7Turn the cold water supply

valve OFF.

8Open the drain valve on the

water heater.

Figure 11 - Draining the old water heater.

9Also open a hot water faucet

to help the water in the tank

drain faster.

10 When the tank is empty,

disconnect the Temperature &

Pressure (T&P) Relief Valve

discharge pipe. You may be able to

reuse the discharge pipe, but do not

reuse the old T&P Relief Valve. A new

T&P Relief Valve comes installed on

your water heater (or on some models,

is in the carton with the water heater).

Figure 12 - Removing the T&P Relief Valve

discharge pipe.

11 Disconnect the water pipes.

Many water pipes are

connected by a threaded

union which can be disconnected with

wrenches. If you must cut the water

pipes, cut the pipes close to the water

heater’s inlet and outlet connec ons,

leaving the water pipes as long as

possible. If necessary, you can make

them shorter later when you install

the new water heater.

12 Remove the old water heater.

WARNING! Use two or more people

to remove or install water heater.

Failure to do so can result in back or

other injury.

INSTALLATION

Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide • 11

Step 4:

Installing the new

water heater

1Completely read all instruc-

 ons before beginning. If you

are not sure you can complete

the installa on, DO NOT RETURN THIS

UNIT TO THE STORE. Seek assistance

from any of the following sources:

• Schedule an appointment with

a qualified person to install your

water heater.

• Call our Technical Assistance Hotline

at 1-888-479-8324

2Install a suitable drain pan (if

required) that is piped to an

adequate drain.

3Set the water heater in place

taking care not to damage the

drain pan.

NOTICE: The drain pan helps avoid

property damage which may occur

from condensa on or leaks in the pip-

ing connec ons or tank. The drain pan

must be at least two inches wider than

the diameter of the water heater. In-

stall the drain pan so the water level is

limited to a maximum depth of 1-3/4in

( 45mm).

4Verify that the water heater is

set in place properly. Check

that:

• The T&P Relief Valve will not be in

contact with any electrical parts.

• There is adequate space to install

the T&P Relief Valve discharge pipe

and that it can be piped to a sepa-

rate drain (and not into the drain

pan).

• There is adequate space to install

proper condensate drain piping.

• There is adequate access and space

around the water heater for future

maintenance. A minimum clearance

of 6in (150mm) must be maintained

from all sides and 6in (150mm) from

the top for access to the air filter.

• Unit is level to allow proper con-

densate drainage. An unlevel unit

may lead to condensate draining

improperly and resulting in property

damage.

DO NOT CONNECT ELECTRICAL

WIRING UNTIL YOU ARE

INSTRUCTED TO DO SO.

NOTICE: Connec ng electrical power

to the tank before it is completely

full of water (water must run FULL

STREAM from a hot water tap for a full

three minutes) will cause the upper

hea ng element to burn out.

Step 5:

Connec ng the Conden-

sate Pump When Re-

quired

NOTE: If no ﬂ oor drain is available or

the drain is above the level of the con-

densate line, a condensate pump must

be installed.

1Follow condensate drain

pump manufacturers instruc-

tions for installation.

Connec ng the Con-

densate Pump Op onal

Overﬂ ow Shut Oﬀ

Switch

1Locate the white 22 AWG wire

loop inside the condensate

drain access compartment by

removing the 4 screws attaching the

condensate drain access cover to the

unit. Cut the loop and strip insulation

off the 2 ends (Figure 13 & Figure 14).

2Measure the distance from

the condensate drain access

cover to the condensate

pump, and cut two 22 AWG wires to

correct length and strip the insula on

at both ends. Thread both ends

through the grommet on the drain pan

cover.

3Connect these 2 wires to the

2 wires on the water heater

using wire nuts or other con-

nectors. Reinstall the condensate drain

access cover and keep the connec on

joints inside of the cover.

4Connect the free ends of the

2 wires to the shut oﬀ switch

on the condensate pump in

accordance with the condensate pump

manufacturers recommenda ons.

Condensate Pump Wiring Loop

22 AWG - White

(Loop Located Close to the Drain Connections)

White Wires

From Water Heater

Wires to Condensate

Pump Overflow

Shut Off Switch

(22 AWG or Larger)

Figure 13 - Wiring Loop for connec on of

Condensate Pump.

INSTALLATION

12 • Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide

Overflow Slot

Primary Drain

Connection

Condensate Drain

Access Cover

Condensate Pump Wiring

Loop 22 AWG-White

(Loop Located Close to the Drain Connections)

Secondary Drain

Connection

Figure 14 - Condensate Pump Wiring

Step 6:

Install Condensate

Drain Lines:

NOTE: When making condensa on

connec ons to the primary connec-

 on DO NOT over ghten! These con-

nec ons should be HAND TIGHTENED

ONLY. Over ghtening could crack or

damage the condensate drain pan.

• Plas c pipe or tubing must be

used to connect the condensate

drain to a suitable drain or con-

densate pump.

• Do not connect condensate

drain lines with other drain or

discharge lines into a single (com-

mon) pipe or line. Each line (con-

densate drain line, temperature

and relief valve discharge pipe,

etc.) should be independently

run to an adequate drain.

• Slope the condensate drain lines

toward the inside ﬂ oor drain or

condensate pump.

• The condensate drain lines and

connec ons to the drain piping

must comply with all local codes.

• Use appropriate ﬁ  ngs and

primer to cement the condensate

drains to the heat pump drain

pan.

• If a condensate pump is installed,

it should be wired to shut oﬀ the

heat pump in the event the con-

densate pump fails or the ﬂ oat

switch in the pump ac vates (see

“Step 5:”).

1Using 3/4 in PVC piping, a

90° elbow that is 3/4 in slip

& 3/4 in NPT and an

approved sealant (none supplied with

unit), a ach the elbow to the primary

drain connec on and insert the PVC

pipe into the female end allowing

enough length to access an adequate

drain.

2Using 1/2” ID rubber or ﬂ exi-

ble plas c tubing, slip one

end over the secondary drain

connec on allowing enough length to

access an adequate drain.

Step 7:

Connect the Tempera-

ture and Pressure (T&P)

Relief Valve/Pipe

Most T&P Relief Valves are pre-

installed at the factory. In some cases,

they are shipped in the carton and

must be installed in the opening

marked and provided for this purpose

and according to local codes.

WARNING! To avoid serious injury

or death from explosion, install a T&P

Relief Valve according to the following

instruc ons:

If your water heater does not have

a factory installed T&P Relief Valve,

install the new T&P Relief Valve that

came with your water heater. Do not

reuse an old T&P Relief Valve. Install

a T&P Relief Valve discharge pipe

according to local codes and the fol-

lowing guidelines:

1The discharge pipe should be

at least 3/4in inside diameter

and sloped for proper

drainage. Install it to allow complete

drainage of both the T&P Relief Valve

and the discharge pipe.

2The discharge pipe must

withstand 250°F (121°C)

without distor on. Use only

copper or CPVC pipe. Most homes

use copper water pipes, or cross-

linked polyethylene (PEX) but some

use CPVC. Use ﬁ  ngs appropriate for

the type of pipe in your home. Do not

use any other type of pipe, such as

PVC, iron, ﬂ exible plas c pipe, or any

type of hose.

Figure 15 - The T&P Relief Valve discharge

pipe must be installed properly and piped

to an adequate drain.

INSTALLATION

Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide • 13

INSTALLATION

3Terminate the discharge pipe

a maximum of 12” (300mm)

above a ﬂ oor drain, sump or

other safe loca on . Do not drain the

discharge pipe into the drain pan;

instead pipe it separately to an

adequate drain.

DISCHARGE

PIPE

DRAIN

PIPE

Figure 16 - The end of the T&P Relief Valve

discharge pipe must stop no more than 12”

(300mm) above a drain .

4Do not place any valve or

other restric on between the

tank and T&P Relief Valve. Do

not cap, block, plug, or insert any valve

between the T&P Relief Valve and the

end of the discharge pipe. Do not

insert or install any reducer in the

discharge pipe.

Step 8:

Install shutoﬀ and

mixing valves

1If one is not already installed,

install a manual shutoﬀ valve

in the cold water line that

supplies the water heater. Install the

shutoﬀ valve near the water heater so

that it is readily accessible. Only use

valves that are compa ble with

potable water. Use only full-ﬂ ow ball

or gate valves. Other types of valves

may cause excessive restric on to the

water ﬂ ow.

2Install a Thermosta c Mixing

Valve . Consult the valve

manufacturer’s instruc ons or

a qualiﬁ ed person.

Figure 17 - Install Thermostatic Mixing

Valves where required.

WARNING! Even if the water

heater’s thermostat(s) are set to a

rela vely low temperature, hot water

can scald. Install Thermosta c Mixing

Valves to reduce the risk of scalding.

3For water heaters that are fed

by a solar water hea ng

system (or any other pre-heat-

ing system), always install a Thermo-

sta c Mixing Valve or other tempera-

ture limi ng device in the inlet water

supply line to limit water supply inlet

temperature to 140°F (60°C). Solar

water hea ng systems can supply water

with temperatures exceeding 170°F

( 77°C) and may result in water heater

malfunc on. Such a malfunc on is not

covered under the water heater

warranty.

WARNING! Hot water provided by

solar hea ng systems can cause severe

burns instantly, resul ng in severe

injury or death (page 4).

Step 9:

Connect the water

supply

1Determine the type of water

pipes in your home. Most

homes use copper water

pipes or cross-linked polyethylene

(PEX) but some use CPVC. Use ﬁ  ngs

appropriate for the type of pipe in

your home. Do not use iron or PVC

pipe – they are not suitable for potable

water.

2Connect the cold water supply

using 3/4in Na onal Pipe

Thread “NPT” to the blue cold

water connec on near the bo om of

the heater.

For ease of removing the water heater

for service or replacement, connect

the water pipes with a union. We

recommend using a dielectric-type

union (available at your local plumbing

supplier ). Dielectric unions can help

prevent corrosion caused by tiny elec-

tric currents common in copper water

pipes and can help extend the life of

the water heater.

Recircula ng Loop

In order to optimize efficiency of this

unit, it is not recommended for use

with a recirculation loop. Using this in

a recirculation loop may cause the unit

to run excessively.

INSTALLATION

14 • Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide

IF YOU HAVE COPPER PIPES:

If your home has copper water pipes,

you can solder the water pipe connec-

 ons or use compression ﬁ  ngs which

don’t require soldering. Compression

ﬁ  ngs are easier to install than solder-

ing pipe. Check with local plumbing of-

ﬁ cials to determine what types of pipe

materials are suitable for your loca on.

Do not use lead-based solder.

NOTICE: Do not solder pipes while they

are a ached to the water heater. The

water heater’s inlet and outlet connec-

 ons contain non-metallic parts which

could be damaged. The proper way to

connect the water heater to copper

water pipes is as follows:

• Solder a short length of pipe (about

a foot or so) to a threaded adapter

using only lead-free solder. A ach

the threaded adapters to the water

heater’s connec ons (using Tef-

lon® tape or pipe joint compound).

Connect the home’s water pipes by

soldering, keeping the connec ons at

the water heater cool with wet rags.

NOTE: Do not over apply joint com-

pound.

NOTICE: This water heater model con-

tains an outlet connec on (J-tube) that

has an orienta on mark that must line

up with arrow (in a 12 o’clock posi on).

3Connect the hot water supply

using 3/4in NPT to the hot

water outlet. Follow the same

connec on guidelines as for the cold

water supply.

4Install insula on on the water

pipes . Insula ng the hot water

pipes can increase energy

eﬃ ciency.

5Double check to make sure

the hot and cold water pipes

are connected to the correct

hot and cold water ﬁ  ngs on the

water heater.

6If needed, install Pressure

Reducing Valve and install a

Thermal Expansion Tank.

Figure 18 - A Pressure Reducing Valve is

required if your home’s water pressure is

above 80 psi/550kPa.

Figure 19 - The Thermal Expansion Tank

should be pressurized with air, to match the

home’s incoming water pressure.

Step 10:

Verify connec ons and

completely ﬁ ll tank

To remove air from the tank and allow

the tank to ﬁ ll completely with water,

follow these steps:

1Remove the aerator at the

nearest hot water faucet. This

allows any debris in the tank

or plumbing system to be washed out.

2Turn the cold water supply

back on.

Full-ﬂ ow ball valve

Figure 20 - Fully open the cold water supply

valve.

INSTALLATION

Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide • 15

INSTALLATION

3Open a hot water faucet and

allow the water to run un l it

ﬂ ows with a full stream.

4Let the water run full stream

for three full minutes.

5Close the hot water faucet and

replace the aerator.

6Check inlet and outlet connec-

 ons and water pipes for leaks.

Dry all pipes so that any drips

or leaks will be apparent. Repair any

leaks. Almost all leaks occur at connec-

 ons and are not a tank leak.

Step 11:

Make electrical

connec ons

WARNING! Working on an ener-

gized circuit can result in severe injury

or death from electrical shock.

NOTICE: Do not turn electrical power

on unless you are sure all of the air is

out of the tank and the tank is com-

pletely full of water. Although this water

heater is equipped with “Dry Fire” pro-

tec on, be certain all air is purged from

the tank before making any electrical

connec ons.

1Be sure the electrical power to

the water heater is turned OFF

at the circuit breaker panel (or

remove the circuit’s fuses).

2Using a non-contact circuit

tester, check the wiring to make

certain the power is OFF.

3This water heater requires a

240/208 VAC single phase 30

amp power supply, at 60Hz.

Check the water heater’s data plate

(see Figure 22) and ensure that the

home’s voltage, wiring size (ampacity)

and circuit breaker ra ng and type are

correct for this water heater. Refer to

the wiring diagram located on the

water heater for the correct electrical

connec ons. Ensure that wire sizes,

type, and connec ons comply with all

applicable local codes. In the absence of

local codes, the current edi on of the

Canadian Electric Code ( CEC).

Power Supply

Connector

Black Wire

Red Wire

Green

Ground

Wire

1/2” Conduit

Opening

Green Ground Screw

Figure 21 - Connecting the electrical wires.

Figure 22 - The water heater’s electrical

requirements can be determined from the

data plate.

4Remove the cover on the

electrical junc on box on the

side of the water heater.

5Install wiring in an approved

conduit (if required by local

codes). Use a UL listed or CSA

approved strain relief to secure the

electrical wiring to the water heater.

6Connect the ground wire to

the green ground screw.

Connect the home’s two

power wires to the water heater’s two

power wires. Use suitable wire nuts or

other approved means to make the

power connec ons.

7 Replace the junc on box cover

and secure with the screw

provided.

WARNING! Be sure cover is secured

to reduce the risk of ﬁ re and electric

shock.

INSTALLATION

16 • Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide

Opera on

The water heater is now ready for

normal operation. To keep your water

heater working safely and efficiently

and extend its life, perform mainte-

nance as described in maintenance

section beginning on page 28.

Start-up and Opera on

NOTE: The default opera ng mode is

Hybrid, to select a diﬀ erent mode see

“Operating Mode Descriptions” Sec-

tion on page 17.

PRIOR TO BEGINNING OPERATION:

Air ﬁ lter is factory installed with tabs

oriented down for shipping. Please see

maintenance sec on for instruc ons

on removal, cleaning and replacing.

1Turn on electrical power to

the water heater.

2Press the Mode/Enter bu on

to set the opera ng mode.

NOTICE: The water heater will

conduct a system diagnos c (approxi-

mately 8 minutes) prior to returning to

opera on.

3Once the diagnos c sequence

has ﬁ nished, the fan should

turn on. This typically takes 8

minutes, (the User Interface Module

will display “-”, “--”, “---” repe  vely

during this period).

NOTICE: The heat pump’s fan will not

turn on if the incoming water tempera-

ture is less than 59°F/15°C and/or the

ambient air temperature is above

120°F/49°C, or below 45°F/7 °C. Should

the internal diagnos cs detect a

problem with the heat pump, an error

code will be displayed.

4Set the desired opera onal

mode. For typical installa ons,

the factory default mode,

Hybrid Mode oﬀ ers the best combina-

 on of eﬃ ciency and hot water

delivery. For detailed descrip ons of all

opera onal modes see “Adjus ng the

User Interface Module/Opera onal

Modes” sec on.

Step 12:

Adjus ng the

Temperature

With the installa on steps completed,

you may adjust the water heater’s

temperature se ng if desired.

1The water heater’s tempera-

ture se ng has been factory

set to approximately

140°F/60°C . Higher tank temperatures

(140° F/60°C) kill bacteria that cause a

condi on known as “smelly water” and

can reduce the levels of bacteria that

cause water-borne diseases.

WARNING! Higher temperatures

increase the risk of scalding .

A mixing valve must be installed where

required.

Figure 23 - Adjust Thermostat Mixing

Valves to 120°F/49°C or lower.

To adjust the water heater’s tempera-

ture se ng:

• The water temperature setting can

be adjusted by using the Up and

Down buttons on the

UIM (User Interface Module). Using

the up or down buttons, cycle

through the available temperature

set points until the desired temper-

ature is displayed. The temperature

setting will blink on the display;

press the Mode/Enter button to

confirm the selection (see Figure

25).

• The available temperature set

points can be cycled through quick-

ly by pressing and holding the Up

button.

2Please allow adequate  me

for the heater to provide hot

water.

WARNING! If the Thermosta c

Mixing Valves are not set properly (or

not installed) you could scald yourself

while checking the temperature.

3Check water temperature at

several points of use in your

home (for example, bathtub

faucet, shower, or lavatory sink) and

adjust the temperature as needed. If

you aren’t sure how to adjust the

Thermosta c Mixing Valve se ngs, or

aren’t sure if you have Thermosta c

Mixing Valves, contact a qualiﬁ ed

person.

INSTALLATION

Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide • 17

INSTALLATION

Post Installa on Review

1Understand how to use the

User Interface Module to set

the various modes and

func ons.

2Hybrid Mode is the recom-

mended Opera ng Mode.

Understand the various

Opera ng Modes and which mode

may be best, based on ambient

temperature and hot water demands.

3Understand the importance of

rou ne inspec on/ mainte-

nance of the condensate drain

pan and lines. This is to prevent any

possible drain line blockage resul ng in

the condensate drain pan overﬂ owing.

NOTE: If water is coming from the

overﬂ ow slot of the condensate drain

access cover, this indicated that both

condensate drain lines may be blocked

and immediate ac on is required.

Overflow Slot

Drain Access Cover

Primary Drain

Secondary Drain

Figure 24 - Condensate Drain Access

Cover

4To maintain op mal opera-

 on, check, remove and clean

the air ﬁ lter as needed.

5The Installa on Instruc ons

and Use and Care Guide

should be kept with the water

heater for reference.

Water Temperature Ad-

justment

The water temperature can be

adjusted from 95°F / 35°C to 140°F /

60°C. Use the Up and Down Bu ons

on the front panel

to set the desired temperature (see

Figure 25). The se ng temperature

will blink on the display, press Mode/

Enter bu on to conﬁ rm.

The water temperature can be

adjusted quickly by pressing the

“Temperature Up” bu on and holding

for three seconds.

NOTE: Before a emp ng to adjust

the thermostat, read the “Water

Temperature Regula on” sec on. If

the instruc ons are not clear, contact

a qualiﬁ ed person.

NOTE: For increased water demand,

switching (temporarily) to Hybrid

Mode or Electric Mode will decrease

the recovery/re-heat  me. Be sure to

switch back to the desired opera onal

mode when ﬁ nished.

Opera ng Mode De-

scrip ons

The opera ng modes can be changed

sequen ally by pressing the Mode/

Enter bu on (Figure 25). The

Opera on Mode Indica on Light will

turn on when the relevant mode is

selected.

This unit is equipped with technology

that senses the hot water demand

from the unit. While in Eﬃ ciency or

Hybrid mode, during normal usage,

the unit will operate the heat pump

for maximum eﬃ ciency. In  mes that

the water usage is above normal, this

unit has the ability to use one element

(upper or lower) and the heat pump

simultaneously to help improve

recovery. This transi on is seamless

and will go unno ced.

Efficiency Mode -

Provides the highest efficiency and

lowest cost operation by using only

the heat pump for heating. Recovery

time and efficiency will vary with

ambient temperature and relative

humidity. Efficiency will be greatest,

and recovery quickest, when both

are high. At lower temperatures and

relative humidity levels, efficiency will

be lower and recovery will take longer.

Heat pump operation is allowed

between 45°F / 7 °C to 120°F / 49°C

ambient temperature. At ambient

temperatures lower than 45°F / 7 °C

and greater than 120°F / 49°C, the

heat pump will not operate. Similarly,

if the water temperature in the tank is

less than 59°F / 15°C, the heat pump

will not operate. The unit will operate

in electric mode until ambient and

water temperatures return to the safe

operating range of the heat pump.

INSTALLATION

18 • Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide

Hybrid Mode -

This is the default, recommended

setting, combining high energy

efficiency with reduced recovery time.

This mode uses the heat pump as the

primary heating source. The heating

element will heat water if demand

exceeds a predetermined level so

that the set point temperature can be

recovered more quickly.

Electric Mode -

The water heater functions as a

conventional electric unit, relying on

only the elements for heat. This mode

may be useful in periods of increased

hot water demands. Electric Mode will

remain for 48 hours before reverting

back to default mode setting.

Vacation Mode -

The controller will not allow the

temperature to drop below 60°F/15°C

while in Vacation setting. This mode is

recommended when the water heater

is not in use for a long period of time,

to minimize energy consumption

and prevent the water heater from

freezing during cold conditions.

C AUTION! Hydrogen gas builds up

in a hot water system when it is not

used for a long period (two weeks

or more). Hydrogen gas is extremely

ﬂ ammable. If the hot water system

has not been used for two weeks or

more, open a hot water faucet for

several minutes at the kitchen sink

before using any electrical appliances

connected to the hot water system.

Do not smoke or have an open ﬂ ame

or other igni on source near the fau-

cet while it is open.

NOTE: When Vacation Mode is

selected, the vacation timer will be

displayed. Press the Up and Down

button to modify the timer to desired

number of vacation days (setting

range: 1 to 99 days). The vacation

timer will blink on the display; press

the Mode/Enter button to confirm the

vacation timer. To deactivate Vacation

Mode, press the Mode/Enter button

to switch to the desired mode.

NOTE: Do not shut off power to the

unit for extended periods of time.

If power must be turned off for an

extended period of time, drain the

tank completely.

Other Controls

°F/°C Switch - Press “Temperature

Down” button and hold for 3 seconds

to switch temperature unit between

Fahrenheit and Celsius

Power Saver Enable/Disable:

• Press “Mode/Enter” button and

hold for 3 seconds. The power

saver feature will be activated

and the display will show “P.S.”

(not to be mistaken with P5), and

the setting temperature alterna-

tively. This feature allows the unit

to be managed by grid or other

utility based load management

programs.

• To deactivate the power saver,

press “Mode/Enter” button and

hold for 3 seconds.

Heat pump defrosting indication:

• There will be frost accumulat-

ing on the evaporator when the

heat pump is operated under low

ambient temperatures. The con-

troller will order the unit to enter

into defrosting cycle to optimize

the heat pump operation per-

formance. During the defrosting

period, the user interface module

will display “ICE” as an indication.

Out of heat pump operation range:

• The user interface module will

display “HPO” as an indication

that the ambient and/or water

temperature condition is out of

the heat pump operation range.

NOTE: The display will go into “Sleep

Mode” for energy saving if there is no

operation on any button for 15 min-

utes. All the display and lights will be

turned off except for the “Operational

Mode Indication Light”, which will

remain illuminated while the unit is

powered on. The unit can be awak-

ened by pressing any button.

INSTALLATION

Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide • 19

INSTALLATION

Figure 25 - User Interface Module (UIM) Display

xxxxx

Vacuum Relief Valve

(when required by local code)

Cold Water

Inlet Valve

Cold Water

Inlet

Pressure Reducing Valve (PRV)

should be installed where the water

supply enters the residence.

When installed PRVs create a

closed water system, a thermal

expansion tank must be installed.

* If an adequate drain is not available for the condensate drain lines then a condensate pump must be used. DO NOT discharge the condensate drain

lines into the metal drain pan.

In a closed system, use a

thermal expansion tank.

See “Closed System/

Thermal Expansion”

section.

12” / 300mm Maximum

Air Gap

Shut-off Valve

(Cold)

*Primary Condensate Drain (3/4” PVC)

Tempered Water to Fixtures

Optional Mixing Valve - Follow the Mixing

Valve’s Manufacturer’s Installation

Instructions. (Set to 120°F / 49°C)

Untempered Water Outlet

Shut-off Valve (Hot)

Union

Drain Line 1”

ID Minimum

Drain Pan

2 1/2” / 64mm Depth

Maximum and

2” / 50mm wider

than the water

heater.

Discharge Pipe

(Do Not Cap or Plug)

Temperature and

Pressure Relief Valve

Union

Drain

Cold

(Inlet)

Hot

(Outlet)

Optional Heat Trap Piping

1/2” Flexible

Secondary

Condensate

Tubing

Union

Figure 26 - Completed Water System Piping

TROUBLESHOOTING

20 • Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide

NOTE: The diagnostic codes listed above are the most common. If a diagnostic code not listed above is displayed,

contact Residential Technical Assistance referencing the number on the front of this manual.

DIAGNOSTIC CODES

DISPLAY SHOWS INDICATES CORRECTIVE ACTION

“-”,”--”,”---” Unit is doing a system

diagnostic.

Normal operation--no action

ICE Heat pump is in defrosting

cycle.

HPO Ambient temperature

45°F-120°F (7.2°C-49°C), average

tank temperature of 59°F (15°C)

or less.

EUC Upper element is not

functioning

1. Turn off power at the circuit breaker/fuse box and

check for a loose connection at the element. For access

directions see “Replacing the Heating Element” Section

on page 29. If error persists proceed to the next step.

2. Replace non-functioning element. See “Replacing the

Heating Element” Section on page 29.

ELC Lower element is not

functioning

1. Turn off power at the circuit breaker/fuse box and

check for a loose connection at the element. For access

directions see “Replacing the Heating Element” Section

on page 29. If error persists proceed to the next step.

2. Replace non-functioning element. See “Replacing the

Heating Element” Section on page 29.

SF The air filter is dirty. 1. Turn off power at the circuit breaker/fuse box.

2. Clean the air filter. See “Air Filter Maintenance” Section

on page 32.

ECF The heat pump compressor is

starting/stopping frequently.

1. Turn off power at the circuit breaker/fuse box.

2. Clean the air filter. See “Air Filter Maintenance” Section

on page 32.

3. If error persist, please contact a qualified person to

check the fan wire connection.

E20 or E21 Upper Temperature Sensor is

not functioning.

Contact a qualified person to service the unit.

E30 or E31 Lower Temperature Sensor is not

functioning.

E50 or E51 Heat Pump Suction Temperature

Sensor is not functioning.

E10 or E11 Heat Pump Coil Temperature

Sensor is not functioning.

E40 or E41 Heat Pump Discharge

Temperature Sensor is not

functioning.

Edr Not enough water in the tank

(tank not full). This is also

referred to as “Dry Fire”.

Refer to “Verify connections and completely fill tank” Section

on page 14 Open all hot water taps in home and run until

water (uninterrupted) flows from all open hot water taps.

Page is loading ...

GSW Hybrid Electric Heat Pump Installation guide

GSW Hybrid Electric Heat Pump Installation guide

GSW Hybrid Electric Heat Pump Installation guide

Related papers

Other documents